21/3y=1

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Solution for 21/3y=1 equation: 



21/3y=1

We move all terms to the left:

21/3y-(1)=0



Domain of the equation: 3y!=0

y!=0/3

y!=0

y∈R



We multiply all the terms by the denominator


-1*3y+21=0

Wy multiply elements

-3y+21=0

We move all terms containing y to the left, all other terms to the right

-3y=-21

y=-21/-3

y=+7

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